Some currencies with no subunit definition, define a subunit_to_unit value > 1

[efung]

The following currencies do not have a named subunit, but their subunit_to_unit value is greater than 1.

XFU: https://en.wikipedia.org/wiki/UIC_franc

Some kind of virtual currency. Doesn't appear to have subunits?

HUF: https://en.wikipedia.org/wiki/Hungarian_forint

Wikipedia says this currency was formerly divided into 100 subunits called fillér, but that those coins are no longer in circulation as of 1999. Not sure what's best here: set the subunit_to_unit value to 1, or name the subunit.

IRR: https://en.wikipedia.org/wiki/Iranian_rial

Wikipedia says rials are divided into 100 subunits called dinar, but due to its low purchasing power, the subunit is not practically used. Same treatment as HUF above?

[elfassy]

Some of these already have PRs. These will go out in v4 now that we have support for custom subunit converters

• no subunits for TWD  #361
• no subunits for HUF #360